NAEP Analysis and Scaling - IRT Parameters for the Change and Continuity in American Democracy: Ideas, Institutions, Practices, and Controversies Scale, by Block and Item, Grade 12 U.S. History National Main Assessment (Accommodations Not Permitted [

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NAEP Analysis and Scaling → Estimation of NAEP Score Scales → NAEP Assessment IRT Parameters → U.S. History Assessment IRT Parameters → IRT Parameters for the Change and Continuity in American Democracy: Ideas, Institutions, Practices, and Controversies Scale, by Block and Item, Grade 12 U.S. History National Main Assessment (Accommodations Not Permitted [R2]): 2001

NAEP Technical DocumentationIRT parameters for the change and continuity in American democracy: Ideas, institutions, practices, and controversies scale, by block and item, grade 12 U.S. history national main assessment (accommodations not permitted [R2]): 2001
Block	Item	NAEP ID	a_j	b_j	c_j	d_j1	d_j2	d_j3	d_j4	d_j5
H3	4	H044401	0.91	-0.66	0.16	†	†	†	†	†
	5	H044501	0.52	0.85	0.00	-1.18	1.93	-0.75	†	†
	10	H044901	0.67	0.75	0.27	†	†	†	†	†
H4	3	H045701	0.77	0.51	0.16	†	†	†	†	†
	5	H045901	0.88	0.46	0.00	0.77	-0.77	†	†	†
	6	H046001	0.60	1.12	0.00	†	†	†	†	†
	12	H046501	1.61	1.20	0.17	†	†	†	†	†
	17	H046901	1.29	0.70	0.18	†	†	†	†	†
	18	H046902	1.39	0.82	0.28	†	†	†	†	†
H5	5	H062401	1.15	1.29	0.18	†	†	†	†	†
	6	H062501	0.59	0.89	0.22	†	†	†	†	†
	7	H062601	0.57	-0.19	0.20	†	†	†	†	†
	9	H062801	1.07	1.48	0.10	†	†	†	†	†
	10	H062901	0.74	-0.12	0.19	†	†	†	†	†
	11	H063001	1.18	1.44	0.23	†	†	†	†	†
H6	1	H048601	0.52	-0.69	0.19	†	†	†	†	†
	2	H048701	0.61	0.57	0.18	†	†	†	†	†
	3	H048801	1.11	1.40	0.18	†	†	†	†	†
	4	H048901	0.51	1.45	0.00	-1.79	1.79	†	†	†
	6	H049101	0.87	0.67	0.23	†	†	†	†	†
	7	H049102	0.54	-1.50	0.18	†	†	†	†	†
	10	H049401	0.62	2.52	0.00	0.10	-0.11	0.02	†	†
H7	2	H050101	0.65	1.04	0.00	0.05	-0.49	0.44	†	†
	7	H050401	0.89	1.29	0.19	†	†	†	†	†
	8	H050501	0.83	0.99	0.14	†	†	†	†	†
H8	2	H051401	0.57	2.11	0.28	†	†	†	†	†
	3	H051501	2.23	0.98	0.28	†	†	†	†	†
	4	H051601	1.00	1.21	0.13	†	†	†	†	†
	8	H052001	0.71	-0.62	0.18	†	†	†	†	†
	13	H052401	1.62	1.60	0.21	†	†	†	†	†
H9	3	H060601	0.63	0.11	0.16	†	†	†	†	†
	4	H060701	0.90	0.99	0.00	0.15	-0.15	†	†	†
	11	H061401	0.73	-1.27	0.19	†	†	†	†	†
	12	H061501	0.68	-0.08	0.00	0.30	-0.30	†	†	†
	16	H061901	0.62	-0.37	0.18	†	†	†	†	†
H10	2	H042001	0.60	0.76	0.17	†	†	†	†	†
	8	H042501	1.22	0.41	0.13	†	†	†	†	†
	9	H042601	0.80	-0.90	0.19	†	†	†	†	†
	10	H042602	1.04	1.69	0.08	†	†	†	†	†
	13	H042801	1.05	0.74	0.00	†	†	†	†	†
H11	12	H064901	0.66	0.43	0.00	0.46	-0.46	†	†	†
† Not applicable; the number of item parameters estimated depends upon the IRT model used for scaling. NOTE: For item j, a_j represents the discriminatory power of the item, b_j represents a location parameter related to item difficulty, c_j represents the guessing parameter, and d_ji is the category threshold parameter for category i. The c-parameter value is exactly zero for items scaled with the two-parameter logistic model or the generalized partial credit model. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2001 U.S. History Assessment.

Last updated 14 July 2008 (KL)

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